如何通过 TCP 连接获取 GPS 设备数据 GT06 CONCOX 协议

Question

从 GPS 设备接收数据： 我有一个 TCP 服务器设置，它从各种 GPS 跟踪器 (GT06) 接收数据。每个 GPS 设备发起请求，服务器接受它，并开始接收 NMEA 数据。 问题是当 GPS 连接到服务器时出现错误：“现有连接被远程主机强行关闭”

问题是我不知道如何通过 GPRS/TCP 连接从 GPS 接收数据。 有什么建议吗？

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace T1
{
        class Program
       {
    public class StateObject
    {
        public const int DEFAULT_SIZE = 1024;           //size of receive buffer

        public byte[] buffer = new byte[DEFAULT_SIZE];  //receive buffer
        public int dataSize = 0;                        //data size to be received
        public bool dataSizeReceived = false;           //received data size?
        public StringBuilder sb = new StringBuilder();  //received data String
        public int dataRecieved = 0;

        public Socket workSocket = null;                //client socket.
        public DateTime TimeStamp;                      //timestamp of data

        public const int BufferSize = 256;
    } //end class StateObject




    public static AutoResetEvent allDone = new AutoResetEvent(false);
    public static AutoResetEvent acceptDone = new AutoResetEvent(false);


    static void Main(string[] args)
    {



        StartListening();





   }


    public static void StartListening()
    {
        // Data buffer for incoming data.
        byte[] bytes = new Byte[1024];

        // Establish the local endpoint for the socket.
        // The DNS name of the computer
        // running the listener is "host.contoso.com".
        IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());
        IPAddress ipAddress = ipHostInfo.AddressList[0];
        IPAddress local = IPAddress.Parse("103.118.16.129");
        IPEndPoint localEndPoint = new IPEndPoint(ipAddress, 8821);

        // Create a TCP/IP socket.
        Socket listener = new Socket(AddressFamily.InterNetwork,
            SocketType.Stream, ProtocolType.Tcp);

        // Bind the socket to the local endpoint and listen for incoming connections.
        try
        {
            listener.Bind(localEndPoint);
            listener.Listen(100);

            while (true)
            {
                // Set the event to nonsignaled state.
                allDone.Reset();

                // Start an asynchronous socket to listen for connections.
                 Console.WriteLine("Waiting for a connection...");
                listener.BeginAccept(new AsyncCallback(AcceptCallback), listener);

                // Wait until a connection is made before continuing.
                allDone.WaitOne();
            }

        }
        catch (Exception e)
        {
             Console.WriteLine(e.ToString());
        }

        // Console.WriteLine("\nPress ENTER to continue...");
        // Console.Read();

    }

    private static void Send(Socket handler, String data)
    {
        // Convert the string data to byte data using ASCII encoding.
        byte[] byteData = Encoding.ASCII.GetBytes(data);

        // Begin sending the data to the remote device.
        handler.BeginSend(byteData, 0, byteData.Length, 0,
            new AsyncCallback(SendCallback), handler);
    }
    private static void Send(Socket handler, byte[] data)
    {
        // Convert the string data to byte data using ASCII encoding.
        // byte[] byteData = Encoding.ASCII.GetBytes(data);

        // Begin sending the data to the remote device.
        handler.BeginSend(data, 0, data.Length, 0,
            new AsyncCallback(SendCallback), handler);
    }

    private static void SendCallback(IAsyncResult ar)
    {
        try
        {
            // Retrieve the socket from the state object.
            Socket handler = (Socket)ar.AsyncState;

            // Complete sending the data to the remote device.
            int bytesSent = handler.EndSend(ar);
             Console.WriteLine("Sent {0} bytes to client.", bytesSent);

            handler.Shutdown(SocketShutdown.Both);
            handler.Close();

        }
        catch (Exception e)
        {
             Console.WriteLine(e.ToString());
        }
    }


    public static void AcceptCallback(IAsyncResult ar)
    {
        // Signal the main thread to continue.
        allDone.Set();

        // Get the socket that handles the client request.
        Socket listener = (Socket)ar.AsyncState;
        Socket handler = listener.EndAccept(ar);

        // Create the state object.
        StateObject state = new StateObject();
        state.workSocket = handler;
        handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
       new AsyncCallback(ReadCallback), state);
    }



    static byte[] Unpack(string data)
    {
        //return null indicates an error
        List<byte> bytes = new List<byte>();

        // check start and end bytes

        if ((data.Substring(0, 4) != "7878") && (data.Substring(data.Length - 4) != "0D0A"))
        {
            return null;
        }

        for (int index = 4; index < data.Length - 4; index += 2)
        {
            bytes.Add(byte.Parse(data.Substring(index, 2), System.Globalization.NumberStyles.HexNumber));
        }
        //crc test
        byte[] packet = bytes.Take(bytes.Count - 2).ToArray();
        byte[] crc = bytes.Skip(bytes.Count - 2).ToArray();

        uint CalculatedCRC = crc_bytes(packet);


        return packet;
    }


    static public UInt16 crc_bytes(byte[] data)
    {
        ushort crc = 0xFFFF;

        for (int i = 0; i < data.Length; i++)
        {
            crc ^= (ushort)(Reflect(data[i], 8) << 8);
            for (int j = 0; j < 8; j++)
            {
                if ((crc & 0x8000) > 0)
                    crc = (ushort)((crc << 1) ^ 0x1021);
                else
                    crc <<= 1;
            }
        }
        crc = Reflect(crc, 16);
        crc = (ushort)~crc;
        return crc;
    }


    static public ushort Reflect(ushort data, int size)
    {
        ushort output = 0;
        for (int i = 0; i < size; i++)
        {
            int lsb = data & 0x01;
            output = (ushort)((output << 1) | lsb);
            data >>= 1;
        }
        return output;
    }

    public static void ReadCallback(IAsyncResult ar)
    {
        String content = String.Empty;

        // Retrieve the state object and the handler socket
        // from the asynchronous state object.
        StateObject state = (StateObject)ar.AsyncState;
        Socket handler = state.workSocket;

        // Read data from the client socket. 
        int bytesRead = handler.EndReceive(ar);

        if (bytesRead > 0)
        {

            if (state.buffer[3] == 1)
            {

                string input = BitConverter.ToString(state.buffer, 0, bytesRead).Replace("-", "");


                Console.WriteLine("Recived {0} bytes to client.", input);

                //byte[] bytes = Unpack(input);

                //byte[] serialNumber = bytes.Skip(bytes.Length - 2).ToArray();

                //byte[] response = { 0x78, 0x78, 0x05, 0x01, 0x00, 0x00, 0x00, 0x0 };

                //serialNumber.CopyTo(response, 4);

                //UInt16 sendCRC = crc_bytes(response.Take(response.Length - 2).ToArray());

                //response[response.Length - 2] = (byte)((sendCRC >> 8) & 0xFF);
                //response[response.Length - 1] = (byte)((sendCRC) & 0xFF);

                //Send(handler, response);
                // handler.Send(response);
            }
            else
            {
                // There  might be more data, so store the data received so far.
                //state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));

                // Check for end-of-file tag. If it is not there, read 
                // more data.
                // content = state.sb.ToString();

                Console.WriteLine("Recived {0} bytes to client.", Encoding.ASCII.GetString(state.buffer, 0, bytesRead));


                //  SaveData(content);
                // Not all data received. Get more.
                handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
           new AsyncCallback(ReadCallback), state);
                // }
            }
        }
    }
}

}

Answer 1

@jdweng​​p>

先生，我尝试了您的建议，但同样的问题没有收到任何消息。

 using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;

namespace T1
{
    internal class Program
    {
        public class StateObject
        {
            public const int DEFAULT_SIZE = 1024;           //size of receive buffer

        public byte[] buffer = new byte[DEFAULT_SIZE];  //receive buffer
        public int dataSize = 0;                        //data size to be received
        public bool dataSizeReceived = false;           //received data size?
        public StringBuilder sb = new StringBuilder();  //received data String
        public int dataRecieved = 0;

        public Socket workSocket = null;                //client socket.
        public DateTime TimeStamp;                      //timestamp of data

        public const int BufferSize = 256;
    } //end class StateObject

    public static AutoResetEvent allDone = new AutoResetEvent(false);
    public static AutoResetEvent acceptDone = new AutoResetEvent(false);

    private static void Main(string[] args)
    {
        Write_log("StartListening");
        StartListening();

    }

    public static void StartListening()
    {
        // Data buffer for incoming data.
        byte[] bytes = new Byte[1024];

        // Establish the local endpoint for the socket.
        IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Any, 8821);

        // Create a TCP/IP socket.
        Socket listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

        // Bind the socket to the local endpoint and listen for incoming connections.
        try
        {
            listener.Bind(localEndPoint);
            listener.Listen(100);

            // Set the event to nonsignaled state.
            allDone.Reset();

            // Start an asynchronous socket to listen for connections.
            Console.WriteLine("Waiting for a connection...");
            Write_log("Waiting for a connection...");
            listener.BeginAccept(new AsyncCallback(AcceptCallback), listener);

            // Wait until a connection is made before continuing.
            allDone.WaitOne();
            Write_log("allDone");
        }
        catch (Exception e)
        {
            Console.WriteLine(e.ToString());
        }

        // Console.WriteLine("\nPress ENTER to continue...");
        // Console.Read();
    }

    private static void Send(Socket handler, String data)
    {
        // Convert the string data to byte data using ASCII encoding.
        byte[] byteData = Encoding.ASCII.GetBytes(data);

        // Begin sending the data to the remote device.
        handler.BeginSend(byteData, 0, byteData.Length, 0,
            new AsyncCallback(SendCallback), handler);
    }

    private static void Send(Socket handler, byte[] data)
    {
        // Convert the string data to byte data using ASCII encoding.
        // byte[] byteData = Encoding.ASCII.GetBytes(data);

        // Begin sending the data to the remote device.
        handler.BeginSend(data, 0, data.Length, 0, new AsyncCallback(SendCallback), handler);
    }

    private static void SendCallback(IAsyncResult ar)
    {
        try
        {
            // Retrieve the socket from the state object.
            Socket handler = (Socket)ar.AsyncState;

            // Complete sending the data to the remote device.
            int bytesSent = handler.EndSend(ar);
            Console.WriteLine("Sent {0} bytes to client.", bytesSent);

            handler.Shutdown(SocketShutdown.Both);
            handler.Close();
        }
        catch (Exception e)
        {
            Console.WriteLine(e.ToString());
        }
    }

    public static void AcceptCallback(IAsyncResult ar)
    {
        // Signal the main thread to continue.
        allDone.Set();

        // Get the socket that handles the client request.
        Socket listener = (Socket)ar.AsyncState;
        Socket handler = listener.EndAccept(ar);

        // Create the state object.
        StateObject state = new StateObject();
        state.workSocket = handler;
        handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
       new AsyncCallback(ReadCallback), state);

        Write_log("ReadCallback...");
    }

    private static byte[] Unpack(string data)
    {
        //return null indicates an error
        List<byte> bytes = new List<byte>();

        // check start and end bytes

        if ((data.Substring(0, 4) != "7878") && (data.Substring(data.Length - 4) != "0D0A"))
        {
            return null;
        }

        for (int index = 4; index < data.Length - 4; index += 2)
        {
            bytes.Add(byte.Parse(data.Substring(index, 2), System.Globalization.NumberStyles.HexNumber));
        }
        //crc test
        byte[] packet = bytes.Take(bytes.Count - 2).ToArray();
        byte[] crc = bytes.Skip(bytes.Count - 2).ToArray();

        uint CalculatedCRC = crc_bytes(packet);

        return packet;
    }

    static public UInt16 crc_bytes(byte[] data)
    {
        ushort crc = 0xFFFF;

        for (int i = 0; i < data.Length; i++)
        {
            crc ^= (ushort)(Reflect(data[i], 8) << 8);
            for (int j = 0; j < 8; j++)
            {
                if ((crc & 0x8000) > 0)
                    crc = (ushort)((crc << 1) ^ 0x1021);
                else
                    crc <<= 1;
            }
        }
        crc = Reflect(crc, 16);
        crc = (ushort)~crc;
        return crc;
    }

    static public ushort Reflect(ushort data, int size)
    {
        ushort output = 0;
        for (int i = 0; i < size; i++)
        {
            int lsb = data & 0x01;
            output = (ushort)((output << 1) | lsb);
            data >>= 1;
        }
        return output;
    }

    public static void ReadCallback(IAsyncResult ar)
    {
        String content = String.Empty;

        // Retrieve the state object and the handler socket
        // from the asynchronous state object.
        StateObject state = (StateObject)ar.AsyncState;
        Socket handler = state.workSocket;

        // Read data from the client socket.
        int bytesRead = handler.EndReceive(ar);

        Write_log(bytesRead.ToString());

        if (bytesRead > 0)
        {
            if (state.buffer[3] == 1)
            {
                string input = BitConverter.ToString(state.buffer, 0, bytesRead).Replace("-", "");

                Console.WriteLine("Recived {0} bytes to client.", input);

                //byte[] bytes = Unpack(input);

                //byte[] serialNumber = bytes.Skip(bytes.Length - 2).ToArray();

                //byte[] response = { 0x78, 0x78, 0x05, 0x01, 0x00, 0x00, 0x00, 0x0 };

                //serialNumber.CopyTo(response, 4);

                //UInt16 sendCRC = crc_bytes(response.Take(response.Length - 2).ToArray());

                //response[response.Length - 2] = (byte)((sendCRC >> 8) & 0xFF);
                //response[response.Length - 1] = (byte)((sendCRC) & 0xFF);

                //Send(handler, response);
                // handler.Send(response);
            }
            else
            {
                // There  might be more data, so store the data received so far.
                //state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));

                // Check for end-of-file tag. If it is not there, read
                // more data.
                // content = state.sb.ToString();

                Console.WriteLine("Recived {0} bytes to client.", Encoding.ASCII.GetString(state.buffer, 0, bytesRead));

                //  SaveData(content);
                // Not all data received. Get more.
                handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReadCallback), state);
                // }
            }
        }
    }

    private static void Write_log(string logx)
    {
        StringBuilder sb = new StringBuilder();

        string rootPath = System.IO.Path.GetDirectoryName(Process.GetCurrentProcess().MainModule.FileName);

        sb.Append(logx);

        // flush every 20 seconds as you do it
        File.AppendAllText(rootPath + "//log.txt", sb.ToString());
        sb.Clear();
    }
}

}